高G值冲击载荷下小型猪脊柱胸腰段输出响应的变化

10只小型猪分别以仰卧位和直立位的体位在冲击塔上接受2量程,共4次的高G值冲击,观察脊柱T12/L1部位头盆向(Gz)、胸背向(Gx)和左右向(Gy)的输出响应变化,同时比较体表(胸骨剑突部位)头盆向和胸背向的输出响应.结果表明脊柱T12/L1部位的最大输出响应与受到载荷的方向一致.在输入载荷基本相同的条件下,Gz方向的输出大于Gx方向的输出,体表输出变化远大于体内的输出响应.说明脊柱部位的输出响应变化与受到载荷的方向有直接的关系.脊柱的自然弯曲及肌肉、软组织等因素可能是造成体表输出远大于体内输出(超调现象)的主要原因.

Responses of Mini-Pig Thorax-Lumbar Spine under High G Value Impact

In order to observe the output responses of body at Gx, Gz and Gy directions, ten mini-pigs were experienced for 4 impacts of 2.5m and 3.5m high, in supine and upright position respectively on the impact tower. The Gx and Gz output response at thorax-lumbar spine and on the body surface were also been compared. The axis of the max output response was the direction of the loading axis. Under the same load, the output responses of Gz were greater than Gx, and the output responses on the body surface were significantly greater than those at thorax-lumbar spine. These results show that the output response of spine is closely correlative with the axis of loading impact. The spinal physiologic curve, muscle and the soft tissue are probably the main reason which causes the significant difference of output response between the spine and the body surface.